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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Astachov A.M., Erashov A.A., Vasiliev A.D., Buka E.S.
Заглавие : Synthesis and structure of 4-methyl-3-nitro-1-nitromethyl-1H-1,2,4- triazolium perchlorate
Коллективы : "Energetic materials: characterisation, modelling and validation", International Annual Conference of ICT
Место публикации : Energetic materials: characterisation, modelling and validation: Proceedings of the 40th International Annual Conference of ICT. - С. 104
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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Atuchin A.A., Kesler V.G., Gavrilova T.A., Molokeev M. S., Aleksandrov K. S.
Заглавие : Chemical synthesis, crystal structure and electronic parameters of noncentrosymmetric K3WO3F3
Коллективы : International forum on strategic technologies
Место публикации : Proceedings of 4 International forum on strategic technologies (IFOST 2009). - Vol. 3. - С. 213-215
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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Antonova A.B., Chudin O.S., Rubaylo A.I., Pavlenko N.I., Sokolenko W.A., Verpekin V.V., Vasiliev A.D., Semeikin O.V.
Заглавие : Heteronuclear µ-vinylidene complexes containing Re, Cu, Fe, Pt, Pd. Synthesis, structure, IR and NMR spectra
Коллективы : Carbene Chemistry Conference The Ocean Maya
Место публикации : Carbene Chemistry Conference The Ocean Maya. - P.38
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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Patrin G. S., Polyakova K. P., Patrusheva T. N., Velikanov D. A., Volkov N. V., Balaev D. A., Patrin K. G., Klabukov A. A.
Заглавие : Synthesis and magnetic property feature of La0.7Sr0.3MnO3 manganite polycrystalline
Место публикации : III Байкальская международная конференция, Иркутск, 2008, C. 79
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Вид документа : Статья из журнала
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Автор(ы) : Udod L. V., Aplesnin S. S., Sitnikov M. N., Molokeev M. S., Shabanov A. V., Romanova O. B.
Заглавие : New Sn3Mo2O8 compound: Synthesis and structural transitions
Место публикации : Ceram. Int. - 2025. - Article in press. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2025.06.356. - ISSN 18733956 (eISSN)
Примечания : Cited References: 39
Аннотация: A new Sn3Mo2O8 compound was synthesized and its crystal structure was determined. A Sn3Mo2O8/Bi26Mo10O69 (89%/11%) composite was obtained by the solid-state synthesis. Vibrational modes of octahedra and temperatures of softening and disappearance of some modes from the IR absorption spectra in the temperature range of 80–500 K and the frequency range of 350–7000 cm-1 was found. A correlation was established between the temperatures of the thermopower maxima and softening of IR modes, and anomalous in the temperature coefficient of resistance, impedance, which was explained within the displacement-type phase transition model. The activation energy and temperature range of the ionic conductivity in the Sn3Mo2O8 compound was determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Subanakov A., Kovtunets E., Spiridonova T., Sobolev A., Molokeev M. S., Sofich D., Bogdanov A., Bazarov B.
Заглавие : A new structure type of the Na3Yb(BO3)2: Synthesis, crystal structure, thermal behavior, ionic conductivity, and spectroscopy
Колич.характеристики :10 с
Место публикации : Solid State Sci. - 2025. - Vol. 160. - Ст.107821. - ISSN 12932558 (ISSN), DOI 10.1016/j.solidstatesciences.2024.107821. - ISSN 18733085 (eISSN)
Примечания : Cited References: 62. - This work was supported by the Russian Science Foundation (Grant 23-23-00451). The X-ray powder diffraction, thermal analysis, FTIR, HTXRD and conductivity measurements were performed using the resources of the Research Equipment Sharing Center of BINM SB RAS. The absorption spectrum was obtained using the equipment of the Research Equipment Sharing Center of Vinogradov Institute of Geochemistry SB RAS. Ab initio calculations were performed on "Academician V.M. Matrosov" facilities of Irkutsk Supercomputer Center SB RAS [https://hpc.icc.ru/]
Аннотация: New structure of Na3Yb(BO3)2 has been synthesized for the first time using a solid-state reaction method. The crystal structure of the title compound was elucidated using a simulated annealing method. Samples used in powder diffraction analysis for structure determination were prepared via solid-state synthesis. To refine obtained crystal structure, the Rietveld method was applied, yielding the following parameters: triclinic symmetry (sp. gr. P1.), a = 5.1661(1) Å, b = 6.6249(2) Å, c = 8.5991(2) Å, α = 92.089(1)°, β = 93.281(2)°, γ = 88.010(1)°, Z = 2, V = 293.47(1) Å3, Rwp = 4.83, GOF = 4.85. The double borate Na3Yb(BO3)2 congruently melted at 1119 °C exhibited a complex thermal profile, as evidenced by DSC, with four polymorphic transitions observed at 277 °C, 497 °C, 653 °C, and 694 °C. Ab initio calculated IR spectrum of Na3Yb(BO3)2, exhibited a high degree of agreement with the experimentally obtained IR spectrum. The band gap of the title compound was calculated to be 4.7(2) eV using the combination of the Tauc method and DASF method. The calculated energy barrier for sodium ion migration, equal to 0.5 eV, was in a reasonable agreement with the experimentally determined activation energy of 0.75 eV. The title compound exhibited an ionic conductivity of 0.4 × 10−3 S/cm at 1023 K.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Zharkov S. M., Vorobyev S.A., Andryushchenko T.A., Molokeev M. S., Sukhachev A. L., Lin Ch.-R., Chen Y.-Zh., Huang B.-X.
Заглавие : Impact of annealing temperature on the structure, magnetic properties, and organic dyes adsorption capacity of Fe0.5Co2.5O4 nanoparticles obtained by combustion
Колич.характеристики :11 с
Место публикации : J. Alloys Compd. - 2025. - Vol. 1011. - Ст.178421. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2024.178421. - ISSN 18734669 (eISSN)
Примечания : Cited References: 39. - The work was supported by the Russian Science Foundation (project no. 23–22–10025, and by the Krasnoyarsk Regional Fund of Science and Technology Support. The powder diffraction and magnetic measurements were carried out at the analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". The authors also thank the Laboratory of Electron Microscopy of the Siberian Federal University Joint Scientific Center for assistance in conducting the electron microscopy investigations
Аннотация: Fe-doped cobalt oxide nanoparticles, FexCo3-xO4, attract considerable attention due to their unique properties, high application potential, and the ability to vary the properties over a wide range by changing the technological conditions. The annealing temperature is one of the decisive parameters critically affecting the properties of nanoparticles. In this work, we studied the Fe0.5Co2.5O4 (Co3O4 type) nanoparticles synthesized by the combustion method: the impact of annealing temperature (400, 500, 600, 700 and 800 °C) on their structural, morphological, magnetic characteristics and on their ability to absorb organic dyes. X-ray diffraction analysis revealed that the nanoparticles under study consisted of a crystalline phase of Fe0.5Co2.5O4, with an admixture of the iron oxide phase in trace concentrations. A giant increase in the crystallite size due to annealing was observed. Overall, the average crystallite size increased from ⁓5 nm in the as-prepared sample to ⁓110 nm in the sample annealed at 800 °C. These changes in size are explained by the efficiency of the Ostwald ripening process. They are accompanied by an increase in the magnetization of nanoparticles and an appearance of magnetic hysteresis. The study of the adsorption properties of the nanoparticles with respect to the most important water pollutants – organic dyes, i.e. cationic methylene blue (MB) and anionic Congo red (CR) revealed their high selective adsorption capacity to CR. The as-prepared nanoparticles had the highest capacity: the CR dye concentration in water decreased by 90 percent within 5 minutes of exposure to the nanoparticles in concentration of 1 g/L. When the annealing temperature increased from 400 to 800 °C, the adsorption capacity decreased by approximately half, but remained high enough to consider these nanoparticles as a promising material for CR selective removal from water.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sal'nikova E. I., Аndreev О. V., Molokeev M. S., Aleksandrovsky A. S., Biryukov D. Yu., Zatsepin D. A., Oreshonkov A. S., Glukhova P. О., Azarapin N. O., Shulaev N. А., Garipov D. A., Volkova S. S., Denisenko Yu. G.
Заглавие : Synthesis and electron dependent properties of the phosphor Gd2O2S:Ce3+, Tb3+
Колич.характеристики :9 с
Место публикации : ChemistrySelect. - 2025. - Vol. 10, Is. 23. - Ст.e00964. - ISSN 23656549 (eISSN), DOI 10.1002/slct.202500964
Примечания : Cited References: 53. - The study was carried out with the support of the Ministry of Science and Higher Education of the Russian Federation within the framework of the project “Fundamental problems of development methodology and related legal and ethical regulation in the field of application of artificial intelligence systems and models” (FEWZ-2024–0052). D.A. Zatsepin and D.Yu. Biryukov are grateful to the Ministry of Science and Higher Education of Russian Federation (FEUZ-2023–0014) for support. Yu. G. Denisenko, A.S. Aleksandrovsky, and A.S. Oreshonkov are grateful for support by ′′Priority- 2030′′ program for the Tyumen State University and Siberian Federal University, and the state assignment of Kirensky Institute of Physics (FWES-2024–0003). The results of UV spectroscopy were obtained using the equipment of the Center for Collective Use "Rational Nature Management and Physical-Chemical Research" of Tyumen State University
Аннотация: A substitutional solid solution of (Gd0.94Ce0.03Tb0.03)2O3 (Ia3, a = 10.8496 (5) A, V = 1277.1 (2) A3) was obtained by hydrothermal synthesis from rare earth nitrates and sodium hydroxide, followed by calcination in air at 900 °C for 2 h. The subsequent sulfidation of the compound in a hydrogen sulfide stream at 900 °C for 9 h yielded a substitutional solid solution of the oxysulfide (Gd0.94Ce0.03Tb0.03)2O2S (P3m1, a = 3.8682 (4) A, c = 6.6770 (8) A, V = 86.52 (2) A3). A qualitative and quantitative analysis of the obtained samples was carried out using the Rietveld method, along with morphological characterization of the particles. A mechanism for the transformation of particles at different stages of synthesis has been proposed. Combined experimental and theoretical investigations showed possibility of both direct and indirect electronic transitions in (Gd0.94Ce0.03Tb0.03)2O2S. Density functional theory calculations highlighted the complex nature of charge transfer in lanthanide oxysulfides, suggesting further investigations. The results of the study on the photoluminescent properties of the obtained phosphors showed that Tb3+ ions play a major role in the emission processes, with the most intense emission band occurring in the green spectral region at 538 nm. In addition to the narrow terbium bands, weak cerium emission was also observed, covering a broad spectral range of 350-700 nm.
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Вид документа : Статья из журнала
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Автор(ы) : Vnukova N. G., Isakova V. G., Elesina V. I., Tomashevich Ye. V., Churilov G. N.
Заглавие : Study of the dependence of hydroxyl groups numbers on treatment time during the synthesis of fullerenols
Колич.характеристики :6 с
Место публикации : Fuller. Nanotub. Carbon Nanostructures. - 2025. - Article in press. - ISSN 1536383X (ISSN), DOI 10.1080/1536383X.2025.2485241. - ISSN 15364046 (eISSN)
Примечания : Cited References: 41
Аннотация: Our present study aims to obtain and examine the fullerenols (water-soluble derivatives of fullerenes) with various amounts of hydroxyl groups. The work presents the results of obtaining fullerenols by boiling in nitric acid with subsequent hydrolysis of polynitro intermediates with water at different treatment durations. The obtained samples were certified by X-ray photoelectron and IR spectroscopy methods and it was found that 10-h treatment allowed obtaining fullerenol with the composition C60Ox(OH)y, where x + y = 12−14, 15-h treatment yielded C60Ox(OH)y, where x + y = 16−18, and 20-h boiling in acid yielded C60Ox(OH)y, where x + y = 24−26. The reproducibility of the obtained results allowed the addition of a predictable number of functional groups.
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10.

Вид документа : Статья из журнала
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Автор(ы) : Ghosh A., Saikia S., Molokeev M. S., Nag A.
Заглавие : Synthesis and optical properties of organic-inorganic hybrid [(18-Crown-6)K][MoOCl4(H2O)]
Колич.характеристики :6 с
Место публикации : Chem. Asian J. - 2025. - Vol. 20, Is. 1. - Ст.e202401052. - ISSN 18614728 (ISSN), DOI 10.1002/asia.202401052. - ISSN 1861471X (eISSN)
Примечания : Cited References: 18. - A.N. acknowledges Science & Engineering Research Board, India, for Swarnajayanti Fellowship (SB/SJF/2020-21/02), and BRICS grant (e-27558) of Department of Science and Technology, India. A.G. acknowledges University Grants Commission (UGC) India for research fellowship. S.S. acknowledges Prime Minister’s Research Fellowship (PMRF), Ministry of Education, India
Аннотация: Crown ether anchored organic-inorganic hybrid halides have been recently reported as interesting luminescent materials in the visible region of electromagnetic spectrum. Is it possible to develop such crown ether anchored hybrid materials for near infrared emission? Motivated by this question, we designed a new hybrid material, namely, [(18-Crown-6)K][MoOCl4(H2O)]. 18-Crown-6 ether bound with K+ form the cationic part [(18-Crown-6)K]+. The K+ of [(18-Crown-6)K]+ electrostatically interacts with Cl- of the anionic part [MoOCl4(H2O)]- , forming the hybrid crystal [(18-Crown-6)K][MoOCl4(H2O)]. It crystallizes in orthorhombic crystal system with Pnma space group. The Mo(V) possesses one d-electron (d1) in C4v point group symmetry in the [MoOCl4(H2O)]- polyhedra. This electronic configuration leads to multiple spin-allowed d – d transitions along with a ligand to metal charge transfer (LMCT) resulting into multiple optical absorption bands in the near UV-visible-near infrared (NIR) region. The lowest energy d – d transition via 2E (d1xz,dyz)/2E (dxz; d1yz)→2B2 (d1xy) leads to NIR PL with peak at 952 nm, but with a poor intensity at room temperature.
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11.

Вид документа : Статья из журнала
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Автор(ы) : Oreshonkov A. S., Denisenko Yu. G., Azarapin N. O., Voronin A. S., Chernodubov D. A., Evlashin S. A., Volochaev M. N., Nemtsev I. V., Molokeev M. S., Glukhova P. O., Kuular A. A., Maslakov K. I., Sukhanova E. V., Muller-Buschbaum K., Popov Z. I.
Заглавие : Synthesis of MoSSe and WSSe via direct ampule method: Exploring structural and electronic properties, liquid exfoliation and electrocatalytic performance for hydrogen production
Колич.характеристики :10 с
Место публикации : J. Alloys Compd. - 2025. - Vol. 1028. - Ст.180642. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2025.180642. - ISSN 18734669 (eISSN)
Примечания : Cited References: 62. - A.S. Oreshonkov, M.N. Volochaev and I.V. Nemtsev thank for support the state assignment of Kirensky Institute of Physics (No FWES-2024–0003). Yu.G. Denisenko, N.O. Azarapin, M.S. Molokeev and P.O. Glukhova thank for support the state assignment of University of Tyumen (FEWZ-2024-0052). The authors thank Thomas Schäfer (University of Giessen) for his invaluable assistance in developing the synthesis modes. K.I. Maslakov acknowledges support from the Lomonosov Moscow State University Program of Development for providing access to the XPS facility. The authors are grateful to the Joint Supercomputer Center and the Information Technology Centre of Novosibirsk State University. The SEM and TEM measurements were performed at Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". This work was partially performed using resources of the Research Resource Center "Natural Resource Management and Physico-Chemical Research" (University of Tyumen)
Аннотация: Since catalytically active materials require special synthesis conditions, which cause difficulty in scaling, it is necessary to develop new lightweight scalable approaches for industrial applications. The most obvious way is to use elementary components to fabricate complex structures. In our work, we used a fundamental ampoule synthesis method to produce MSSe (M = Mo, W) powders with a homogeneous random distribution of chalcogen atoms. The synthesized samples exhibit P63/mmc space group indicating the existence of 2?H phase which was proved by comprehensive experimental and theoretical analysis and demonstrates rational characteristics in the hydrogen evolution reaction. The Tafel slopes for synthesized MoSSe and WSSe are 93 and 86?mV/dec, respectively. Moreover, the MSSe samples demonstrate the same catalytic activity in the hydrogen evolution reaction as the samples subjected to ultrasonic treatment in N-Methyl-2-pyrrolidone, with Tafel slopes of 92 and 88?mV/dec for MoSSe and WSSe, respectively.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Aleksandrovsky A. S., Chimitova O.D., Pankin D.V., Popov Z.I., Sukhanova E.V., Molokeev M. S., Adichtchev S.V., Pugachev A.M., Nemtsev I. V.
Заглавие : Solid state synthesis, structural, DFT and spectroscopic analysis of EuAl3(BO3)4
Колич.характеристики :10 с
Место публикации : Mater. Chem. Phys. - 2024. - Vol. 320. - Ст.129400. - ISSN 02540584 (ISSN), DOI 10.1016/j.matchemphys.2024.129400. - ISSN 18793312 (eISSN)
Примечания : Cited References: 55. - The work was carried out within the state assignment No FWES-2024-0003 of Kirensky Institute of Physics. This work was partially supported by the state order of BINM SB RAS (0273-2021-0008). The samples for this research were synthesized using equipment of the CCU BINM SB RAS. The reflectance spectrum was obtained at the Center for Optical and Laser Materials Research of Research park of St. Petersburg State University. The SEM measurements were performed at Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Аннотация: Huntite-like borates are versatile and promising materials with wide range of applications in frequency conversion, UV light generation, lighting, displays, quantum information storage, and more, demonstrated by their various properties and uses in scientific research. In this work, EuAl3(BO3)4 powder was prepared through multi-stage solid-state reaction method using high-purity starting reagents: Eu2O3, Al2O3 and H3BO3, considering a 20 wt% excess of H3BO3 to compensate for B2O3 volatilization. Obtained samples undergo several treatments at varying temperatures and their phase purity is subsequently verified through powder X-ray diffraction analysis. The scanning electron microscopy reveals that resulting EuAl3(BO3)4 powder consists of granules exhibiting irregular morphologies with dimensions of 0.5–8 μm. The electronic band structure of EuAl3(BO3)4, calculated using the GGA PBE method, reveals f-states of Eu near 4 eV. These states do not produce emphasized peaks on simulated absorbance spectra. Using of DFT + U for the f-states of Eu pushed up f-bands above 6 eV and the charge transfer from p-O to d-Eu was obtained (Egdirect = 5.63 eV, Egindirect = 5.37 eV using Ueff = 4 eV). The variation of Ueff has a weak influence on the position of the bottom of the conduction band. The experimental bandgaps of EuAl3(BO3)4 crystalline powder, both direct and indirect, are found to be 3.96 and 3.67 eV, correspondingly. These values are lower than theoretical values what is associated with limitations of DFT calculations involving f electrons. The Raman spectrum of EuAl3(BO3)4 powder is discussed, detailing the contributions of different ions to specific spectral bands. Investigation of high-resolution luminescence spectra shows the possibility to estimate the content of defects by the testing the violation of the prohibition of ultranarrow 5D0 → 7F0 line that is forbidden in the ideal crystalline structure of trigonal EuAl3(BO3)4.
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13.

Вид документа : Статья из журнала
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Автор(ы) : Knyazev Yu. V., Platunov M. S., Ikkert O. P., Semenov S. V., Bayukov O. A., Nikolenko A. D., Nazmov V. P., Volochaev M. N., Dubrovskiy A. A., Molokeev M. S., Smorodina E. D., Balaev D. A., Karnachuk O. V.
Заглавие : Microbially mediated synthesis of vivianite by Desulfosporosinus on the way to phosphorus recovery
Колич.характеристики :15 с
Место публикации : Environ. Sci.: Adv. - 2024. - Vol. 3, Is. 6. - P.897-911. - ISSN 27547000 (eISSN), DOI 10.1039/D4VA00040D
Примечания : Cited References: 120. - This study was supported by the Russian Science Foundation, project no. 22-24-00601 (https://rscf.ru/project/22-24-00601/). The electron microscopy and Mössbauer studies were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The research contribution of M. S. P. was partially supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Synchrotron radiation facility “SKIF”, Boreskov Institute of Catalysis (project FWUR-2024-0040)
Аннотация: We explored the role of biomineralization in industrial waste sludge formation, using the laboratory cultivation of Desulfovibrio sp. OL sulfate reducing species isolated from the Komsomolsky waste sludge (Russia). The most frequently reported sulfate-reducing bacteria (SRB) biomineralization products are various iron sulfides. Here we present first studies of the products of Desulfosporosinus metallidurans, acidophilic SRB from acid mine drainage. We analyzed the biomineralized sample using X-ray diffraction, electron microscopy, X-ray absorption and Mossbauer spectroscopies, and magnetization measurements via First-Order Reversal Curve (FORC) diagram analysis. Our findings show that the biomineralization occurring under pure culture conditions leads to the formation of greigite (Fe3S4) nanorods, along with larger microbially mediated crystals of vivianite (Fe3(PO4)2·8H2O) and siderite (FeCO3). Energy dispersive X-ray spectroscopy revealed that the crystal sizes of vivianite and siderite were comparatively larger than those of the nanorod-shaped greigite. Transmission electron microscopy and Mossbauer spectroscopy detected ultrafine ferrihydrite (Fe2O3·nH2O) superparamagnetic nanoparticles with an average size of 2.5 nm. FORC analysis showed significant magnetic interactions among these nanoparticles, suggesting their potential for magnetic separation applications. The current study demonstrates that ferrihydrite nanoparticles have a strong magnetic affinity for other crystal phases produced by Desulfosporosinus metallidurans. Therefore, we believe that the investigated bacterial species can be exploited in advanced magnetic separation techniques. This offers a cost-effective and environmentally friendly method for purifying sediments in industrial waste sludge.
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14.

Вид документа : Статья из журнала
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Автор(ы) : Volkova E. A., Platunov M. S., Antipin A. M., Alpanova R. R., Dubrovskiy A. A., Pyastolova Yu. V., Podobraznyh A. D., Kosorukov V. L., Koporulina E. V., Maltsev V. V.
Заглавие : Synthesis, structure and magnetic properties of monoclinic lanthanum-chromium borate LaCr3(BO3)4
Колич.характеристики :9 с
Место публикации : J. Alloys Compd. - 2024. - Vol. 994. - Ст.174683. - ISSN 0925-8388, DOI 10.1016/j.jallcom.2024.174683. - ISSN 1873-4669
Примечания : Cited References: 38. - Single crystal X-ray analysis was carried out within the State assignment NRC "Kurchatov institute" (research contribution of A.M.A.). The research contribution of M.S.P. was partially supported by the Ministry of Science and Higher Education of the Russian Federation within the governmental assignment for Synchrotron radiation facility "SKIF", Boreskov Institute of Catalysis (project FWUR-2024–0040)
Аннотация: Single crystals of LaCr3(BO3)4 were synthesized through spontaneous nucleation from a K2Mo3O10 flux melt. The crystal structure was determined using single-crystal X-ray diffraction (XRD) at temperatures of 293 K and 85 K. LaCr-borate crystallizes in the monoclinic C2/c space group with unit cell parameters a = 7.47980(5) Å, b = 9.55180(7) Å, c = 11.48330(8) Å, β= 104.0060(6)°, V = 796.04(1) Å3 (for C1, T = 293 K), and a = 7.47380(5) Å, b = 9.55520(7) Å, c = 11.47100(8) Å, β = 103.9330(6)°, V = 795.08(1) Å3 (for C2, T = 85 K), each with Z = 4. The temperature dependence of the unit cell parameters, including the monoclinic angle (β) and the unit cell volume (V), was investigated over the range of 85–293 K. No structural phase transitions were observed in the low-temperature region down to 85 K. Differential scanning calorimetry (DSC) measurements revealed no high-temperature phase transitions between 50 and 1350°C. Infrared (IR) spectroscopy confirmed the monoclinic structure of LaCr3(BO3)4 crystals, revealing characteristic absorption bands, including the lowest frequency mode associated with the translational vibrations of the La3+ ion.
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15.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Иванова, Оксана Станиславовна, Эдельман, Ирина Самсоновна, Lin Chun-Rong, Петров, Дмитрий Анатольевич, Торопова Е. С., Сухачев, Александр Леонидович
Заглавие : Наночастицы Fe0.55Co2.45O4: синтез, магнитные и адсорбционные свойства
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : Новое в магнетизме и магнитных материалах: сборник трудов XXV международной конференции/ прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 1 [Сборник 1]: Новые магнитные и родственные им материалы: синтез и физические свойства. Преподавание по разделам «Магнетизм» и «Магнитные материалы» в высшей школе. - С. 4-6. - ISBN 978-5-4465-1869-2
Примечания : Библиогр.: 5. - РНФ, Красноярский краевой фонд науки, грант № 23-22-10025
Аннотация: Наночастицы Fe0.55Co2.45O4 синтезированы методом самовозгорания в растворе и подвергнуты термообработке различной длительности при различных температурах Ttreat от 400 до 800 °C. Как исходные наночастицы, то есть, частицы непосредственно после синтеза, так и прошедшие термообработку являются нанокристаллами шпинели с параметрами, характерными для Co3O4. Температура Ttreat критически влияет на размеры нанокристаллов и их свойства. Размеры нанокристаллов монотонно возрастают с увеличением Ttreat от 5.2 нм в исходном образце до 48 нм при Ttreat =800 °C. Намагниченность и спектры магнитного кругового дихроизма при этом также очень сильно изменяются, но немонотонно. Обнаружена высокая адсорбционная емкость наночастиц по отношению к анионному красителю Конго красный.
Материалы конференции,
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belskaya N.A., Eremin E. V., Vasiliev A. D., Gavrilkin S.Yu., Vereshchagin S.N., Chikurov D.S., Krasilin A.A., Kazak N. V.
Заглавие : Synthesis, crystal structure, and magnetic properties of Ni2CrBO5
Колич.характеристики :8 с
Место публикации : J. Magn. Magn. Mater. - 2024. - Vol. 604. - Ст.172298. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2024.172298. - ISSN 18734766 (eISSN)
Примечания : Cited References: 75. - The authors acknowledge A. Borus for the electrical resistivity measurements. The X-ray diffraction, magnetic, and specific heat measurements were carried out in the Common Access Facility Center of SB RAS (Krasnoyarsk, Russia) and P.N. Lebedev Physical Institute of RAS (Moscow, Russia)Research is supported by the Russian Science Foundation and Krasnoyarsk Regional Fund of Science and Technology Support, grant No. 24-12-20012, https://rscf.ru/project/24-12-20012/
Аннотация: Ni2CrBO5 has been synthesized and investigated by X-ray diffraction, dc magnetization, and specific heat measurements. The unusual cation distribution has been established: the M1 and M3 sites are occupied by Ni2+ ions, the M2 site is by Cr3+ ions, and the M4 site is mixed, featuring both Ni2+ and Cr3+ ions. The magnetic order onsets at TN= 140 K, which is confirmed by a λ-type peak in specific heat, followed by the dome-shaped anomaly of the magnetization at about 30 K. In the magnetically ordered state, a remarkable sequence of temperature-induced magnetization reversal sensitive to the measurement’s regime is observed. Dominant antiferromagnetic interactions are characterized by the Weiss temperature θ= −73 K. The effective magnetic moment of 5.37 μB per formula unit is close to the spin-only one. The effect of the cation distribution on the magnetic properties is discussed.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Soldatenko A. S., Molokeev M. S., Lazareva N. F.
Заглавие : N-silylmethyl-2-(1-naphthyl)acetamides: Synthesis, structure and computational screening
Колич.характеристики :8 с
Место публикации : Curr. Org. Chem. - 2024. - Vol. 28, Is. 12. - P.959-966. - ISSN 13852728 (ISSN), DOI 10.2174/0113852728296495240409062733. - ISSN 18755348 (eISSN)
Примечания : Cited References: 75. - This work was supported by the Russian Science Foundation using the analytical equipment of the Baikal Center for Collective Use of the SB RAS and the analytical equipment of the Krasnoyarsk Center for Collective Use of SB RAS. M.S. Molokeev’s work was carried out within the framework of the Strategic Academic Leadership Program "Priority-2030" for the Siberian Federal University
Аннотация: Synthesis of new hybrid organosilicon compounds based on the amides 1- naphthylacetic acid was described. N-Organyl-2-(1-naphthyl)-N-[(triethoxysilyl)methyl]- acetamides were obtained by the reaction of 1-naphthylacetyl chloride with α-silylamines RNHCH2Si(OEt)3 (R = Me, i-Pr and Ph). Their subsequent interaction with N(CH2CH2OH)3 led to the formation of N-organyl-2-(1-naphthyl)-N-(silatranylmethyl)acetamides. The structure of these hybrid compounds was characterized by 1H, 13C, and 29Si NMR spectroscopy. The structure of N-methyl- and N-isopropyl-2-(1-naphthyl)-N-(silatranylmethy)acetamides was confirmed by X-ray diffraction analysis. Results of computational screening showed that these silatranes are bioavailable and have drug-likeness.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grigorchenko V.M., Molokeev M. S., Oreshonkov A. S., Aleksandrovsky A. S., Kertman A.V., Abulkhaev M.U., Mereshchenko A.S., Yurev I.O., Shulaev N.А., Kamaev D.N., Elyshev A.V., Andreev O.V.
Заглавие : Synthesis and properties of the NdSF compound, phase diagram of the NdF3–Nd2S3 system
Колич.характеристики :9 с
Место публикации : J. Solid State Chem. - 2024. - Vol. 333. - Ст.124640. - ISSN 00224596 (ISSN), DOI 10.1016/j.jssc.2024.124640. - ISSN 1095726X (eISSN)
Примечания : Cited References: 48. - This research was funded by the Tyumen Oblast Government as part of the West-Siberian Interregional Science and Education Center’s project No. 89-DON (3)The studies ab initio simulation of electron band structure, analysis of optical properties, XRD analysis was partially supported by "Priority-2030" program for the Siberian Federal University, and the state assignment of Kirensky Institute of Physics
Аннотация: The NdF3–Nd2S3 system attracts attention of researchers due to the possibility of using LnSF compounds (Ln = rare earth element) as possible new p- and n-type materials. The samples of this system were synthesized from NdF3 and Nd2S3. The NdSF compound belongs to the PbFCl structural type, P4/nmm space group, unit cell parameters: a = 3.9331(20) Å, c = 6.9081(38) Å. The experimentally determined direct and indirect NdSF bandgaps are equal to 2.68 eV and 2.24 eV. The electronic band structure was calculated via DFT simulation. The NdSF compound melts congruently at T = 1385 ± 10°С, ΔНm = 40.5 ± 10 kJ/mol, ΔS = 24.4 ± 10 J/mol. The NdSF microhardness is 455 ± 10 HV. Five phase transformations in the NdF3–Nd2S3 system were recorded by DSC; their balance equations were derived. The liquidus of the system calculated from the Redlich–Kister equation is fully consistent with the DSC data.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nikolaev N. S., Isakova V. G., Vnukova N. G., Elesina V. I., Glushenko G. A., Tomashevich Y. V., Churilov G. N.
Заглавие : Synthesis of Ni nanoclusters supported on diamond by plasma technique and their electrochemical properties
Колич.характеристики :6 с
Место публикации : Diam. Relat. Mater. - 2024. - Vol. 142. - Ст.110844. - ISSN 09259635 (ISSN), DOI 10.1016/j.diamond.2024.110844. - ISSN 18790062 (eISSN)
Примечания : Cited References: 35
Аннотация: In this study, particles of synthetic undoped diamond (DN) obtained via the high pressure – high temperature method were coated with a nickel shell using metallic nickel plasma in a two-jet plasma generator with gas vortex and magnetic flux stabilization. Through the use of scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy, we observed the formation of a nickel diamond composite with a core-shell structure, where DN serves as the core and Ni nanoclusters form the shell (DN@Ni). The results of voltammetric analysis indicated that DN@Ni, when deposited on a graphite electrode, exhibited significant electrocatalytic activity in the oxidation of methanol and paracetamol in an alkaline electrolyte.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Grigoriev, Maxim V., Ruseikina, Anna V., Molokeev M. S., Chernyshev, Vladimir А., Aleksandrovsky A. S., Krylov A. S., Krylova S. N., Shestakov N. P., Velikanov D. A., Garmonov, Alexander A., Matigorov, Alexey V., Ostapchuk, Evgeny A., Schleid, Thomas, Safin, Damir A.
Заглавие : Elucidating elusive quaternary selenide EuCeCuSe3: Synthesis, crystal structure, properties and theoretical studies
Колич.характеристики :9 с
Место публикации : J. Rare Earths. - 2024. - Vol. 42, Is. 1. - P.163-171. - ISSN 10020721 (ISSN), DOI 10.1016/j.jre.2022.11.004. - ISSN 25094963 (eISSN)
Примечания : Cited References: 47
Аннотация: We report on the novel heterometallic quaternary selenide EuCeCuSe3, the fabrication of which has been a challenge until this work. The structure of the reported selenide was elucidated from the powder X-ray diffraction data, which revealed the formation of EuCeCuSe3 with excellent yield (96.7%) accompanied with a minor fraction of CeSe2 (3.3%), and was best solved in orthorhombic space group Pnma with the BaLaCuS3 structural type. Thus, the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EuRECuSe3 (RE = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y), of which the cerium-based derivative exclusively belongs to the BaLaCuS3 structural type. The distortion of the CuSe4 polyhedron was compared for the whole series of EuRECuSe3 compounds using the τ4-descriptor for four coordinated ions, which revealed the highest degree of distortion for the Ce3+-containing selenide, followed by the La3+-based derivative. Furthermore, the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3 and EuCeCuS3. Ab initio calculations of the crystal structure, a phonon spectrum and elastic constants for the crystal of EuСeCuSe3 were also performed. The types and wavenumbers of fundamental modes were determined and the involvement of ions participating in the phonon modes was assessed. The experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated spectrum. The experimental direct band gap of EuCeCuSe3 was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f (valence band) and 5d (conduction band) levels of the Eu2+ cation. The dependence of the Young's modulus on the direction demonstrates the anisotropy of the elastic properties, while the Vickers hardness for EuCeCuSe3 was calculated to be 5.2 GPa. Finally, the title compound is paramagnetic above 4 K.
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